Patients and staff at Seattle Children's Hospital perform Kelly Clarkson's 'Stronger' as an anthem of strength and hope.

So, too, say the patents of the hematology/oncology floor at the Seattle Children's Hospital.

In the video above — which I dare you to watch without a tissue — these patients rally against cancer and celebrate their inner strength by singing and dancing along with the popular Clarkson hit.

The video was made by 22-year-old Chris Rumble of Kent, Wash., over the weekend and has become a viral sensation on YouTube. Rumble spent Saturday filming fellow patients, doctors and nurses on the unit at Seattle Children’s Hospital. He edited the video Saturday night and uploaded it on Sunday morning. As of this morning, that video had almost 225,000 hits.

Rumble appears in the video bald, singing and wearing an orange T-shirt. He bonded with and became a kind of "big brother" to many of the kids seen in the video after spending 35 days in the ward. Rumble was 21 when he was diagnosed — an age that straddles the line between adult and pediatric care when it comes to cancer.

For her part, singer Clarkson gushed her approval of the video on Twitter, saying on her @Kelly_Clarkson Twitter account: "Oh my goodness y'all have to see this! It's beautiful! I can't wait to visit these kids and nurses!"

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